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Vries EJD, Bemmel PV, Borsje B, Adams ML, Baillies T, Berthels J, Rosario CMD, Egtberts W, Gillingham PJ, Giuliany B, Hancock W, Haustraete K, Herforth S, Hsieh B, Jensen EK, Knapstein H, Mahn FP, Nabholz A, Nedelkovitch G, Nicolas EC, Nicolaux G, Oelrich E, Phillips GF, Phlix J, Richter EF, Schwarze P, Smallidge RL, Steuerle H, Thiele U, Tichelaar GR, Venteicher R, Westergaard S, Woo WO, Zygmunt L. Analysis of Fat-Soluble Vitamins. XXVIII. High Performance Liquid Chromatographic Determination of Vitamin D in Pet Foods and Feeds: Collaborative Study. J AOAC Int 1983. [DOI: 10.1093/jaoac/66.3.751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
A high performance liquid chromatographic (HPLC) method for vitamin D in pet foods and feeds at low concentrations (2-8 IU/g = 50-200 ppb) was studied collaboratively. The procedure consists of the following purification steps: saponification, extraction oMhe unsaponifiable fraction, chromatography on alumina, cleanup on reverse phase HPLC, and quantitation with straight phase HPLC. The original method, developed by Knapstein, was simplified by deleting the quantitative TLC step. Six coded samples were distributed to 31 laboratories, along with a known sample containing 15 IU/g to allow practice of the rather complicated procedure. Eighteen collaborators returned their results. Results for the spiked samples show good recovery. The estimates of repeatability and reproducibility are 0.96 and 2.2 IU/g for spiked samples and 1.5 and 3.1 IU/g for commercial samples, respectively, which are considered acceptable for these low concentrations. The method has been adopted official first action.
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Affiliation(s)
| | | | - Ben Borsje
- Duphar B.V., Research Laboratories, Weesp, The Netherlands
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De Vries EJ, Borsje B, Ameika L, Baillies NT, Delano N, de Vries EJ, Egtberts W, Fischer GA, George E, Gillingham PJ, Hancock W, Knapstein H, Monard A, Muniz JF, Nedelkovitch G, Nicolaux G, Oelrich E, Phillips GF, Pollman R, Richter EF, Scholz H, Schwarze P, Steuerle H, Thiele U, Thorpe VA, Weaver C, Wehr HM. Analysis of Fat-Soluble Vitamins. XXVII. High Performance Liquid Chromatographic arid Gas-Liquid Chromatographic Determination of Vitamin D in Fortified Milk and Milkpowder: Collaborative Study. J AOAC Int 1982. [DOI: 10.1093/jaoac/65.5.1228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
A collaborative study of the high performance liquid chromatographic (HPLC) method for vitamin D in fortified milkpowder (skimmed and whole milk) and a milkpowder preparation was carried out on 182 samples distributed to 26 laboratories. Thirteen laboratories submitted results. The level of vitamin D was 2-7IU vitamin D3/g milkpowder. All samples also contained vitamin A. Three laboratories were excluded from the statistical evaluation because of incomplete results or deviation from the analytical procedure. Other laboratories reported acceptable results. At the same time, 63 samples were distributed to 9 laboratories which used a gas-liquid chromatographic method for determining vitamin D in milkpowder. Only one laboratory reported results. The HPLC method has been adopted official first action.
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Affiliation(s)
| | - Ben Borsje
- Duphar B. V., Research Laboratories, Weesp, The Netherlands
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Vries EJD, Mulder FJ, Borsje B, Ameika L, Anderssen E, Bagnall KW, Baillies T, Bjorholm H, Boufford CE, Bruno JV, Chadde F, Delano N, Vries EJD, Egtberts W, Fine BG, Gillingham PJ, Grady LT, Jekabsons E, Johansson S, Jordi HC, Knapstein H, Kobayashi T, Kring P, Kurtz GW, Lotfy PA, Mahn FP, May EM, Monard A, Minister JV, Nedelkovitch G, Nicolaux G, Oelrich E, Öhrner B, Okano T, Phillips GF, Richter EF, Schwarze P, Steuerle H, Thakker KD, Theivagt J, Townley E, Antwerp JV, Riper ESV, Vuht G, Whall PJ, Woodby JA, Zygmunt L. Analysis of Fat-Soluble Vitamins. XXV. High Performance Liquid Chromatographic Determination of Vitamin D in Multivitamin Preparations: Collaborative Study1. J AOAC Int 1981. [DOI: 10.1093/jaoac/64.1.61] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
The HPLC method for determining vitamin D in multivitamin preparations was studied collaboratively. Samples were distributed to 43 laboratories in 10 countries. Twenty-four laboratories gave their results. The method specifies a reverse phase system for the cleanup and a straight phase system for the determination. Difficulties arise when laboratories are equipped with HPLC apparatus with a single column. Laboratories experienced in vitamin D analysis reported good results, even if they were equipped with a single column HPLC apparatus. Eleven of the 24 laboratories reported satisfactory results. For this rather complicated method, the coefficient of variation for a single assay is acceptable. The method has been adopted official first action as an alternative procedure to the chemical method for determining vitamin D in multivitamins.
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Affiliation(s)
- Ellen J De Vries
- Philips-Duphar B.V., Research Laboratories, Weesp, The Netherlands
| | - Frits J Mulder
- Philips-Duphar B.V., Research Laboratories, Weesp, The Netherlands
| | - Ben Borsje
- Philips-Duphar B.V., Research Laboratories, Weesp, The Netherlands
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